72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
// antenna.hxx -- FGRadioAntenna: class to represent antenna properties
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//
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// Written by Adrian Musceac YO8RZZ, started December 2011.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <simgear/compiler.h>
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#include <simgear/structure/subsystem_mgr.hxx>
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#include <Main/fg_props.hxx>
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#include <simgear/math/sg_geodesy.hxx>
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#include <simgear/debug/logstream.hxx>
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using std::string;
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class FGRadioAntenna
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{
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private:
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/*** load external plot file generated by NEC2. needs to have a txt extension
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* when naming plots, use the following scheme: type_frequencyMHz.txt
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* eg: yagi_110.txt or LPDA_333.txt
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* @param: name of file
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* @return: none
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***/
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void load_NEC_antenna_pattern(string type);
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int _mirror_y;
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int _mirror_z;
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int _invert_ground;
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double _heading_deg;
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double _elevation_angle_deg;
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struct AntennaGain {
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double azimuth;
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double elevation;
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double gain;
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};
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SGPath _pattern_file;
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typedef std::vector<AntennaGain*> AntennaPattern;
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AntennaPattern _pattern;
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public:
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FGRadioAntenna(string type);
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~FGRadioAntenna();
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/*** calculate far-field antenna gain on a 3D volume around it
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* @param: bearing to the other station, vertical angle (some call it theta)
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* @return: gain relative to maximum normalized gain. will be negative in all cases
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***/
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double calculate_gain(double bearing, double angle);
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/// some convenience setters and getters (unused for now)
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inline void set_heading(double heading_deg) {_heading_deg = heading_deg ;};
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inline void set_elevation_angle(double elevation_angle_deg) {_elevation_angle_deg = elevation_angle_deg ;};
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};
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